let me just make a comment...
the amp gauge only shows the current in and out of the battery (excluding starter current).
So if you are running 100 amps worth of lights, radio etc that does not go through the gauge (IF the altenator is working)
I have been thinking similair, but more towards a "smaller" span gauge since battery charging is normally less than 20 amps. (and Limiting current draw prior to running)
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